155661200244 has 72 divisors (see below), whose sum is σ = 429418735200. Its totient is φ = 47151249600.

The previous prime is 155661200239. The next prime is 155661200249. The reversal of 155661200244 is 442002166551.

155661200244 is a `hidden beast` number, since 1 + 556 + 61 + 2 + 0 + 0 + 2 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (155661200239) and next prime (155661200249).

It is a super-2 number, since 2×155661200244² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 155661200199 and 155661200208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155661200249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 932299 + ... + 1086509.

It is an arithmetic number, because the mean of its divisors is an integer number (5964149100).

Almost surely, 2^155661200244 is an apocalyptic number.

It is an amenable number.

155661200244 is an abundant number, since it is smaller than the sum of its proper divisors (273757534956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155661200244 is a wasteful number, since it uses less digits than its factorization.

155661200244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156781 (or 156776 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 155661200244 its reverse (442002166551), we get a palindrome (597663366795).

The spelling of 155661200244 in words is "one hundred fifty-five billion, six hundred sixty-one million, two hundred thousand, two hundred forty-four".