61138040494644 has 24 divisors (see below), whose sum is σ = 158506030912320. Its totient is φ = 20379346831512.

The previous prime is 61138040494591. The next prime is 61138040494681. The reversal of 61138040494644 is 44649404083116.

61138040494644 is a `hidden beast` number, since 6 + 1 + 13 + 80 + 4 + 0 + 494 + 64 + 4 = 666.

It is a super-3 number, since 3×61138040494644³ (a number of 42 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283046483664 + ... + 283046483879.

It is an arithmetic number, because the mean of its divisors is an integer number (6604417954680).

Almost surely, 2^{61138040494644} is an apocalyptic number.

It is an amenable number.

61138040494644 is an abundant number, since it is smaller than the sum of its proper divisors (97367990417676).

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

61138040494644 is a wasteful number, since it uses less digits than its factorization.

61138040494644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566092967556 (or 566092967548 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 54.

The spelling of 61138040494644 in words is "sixty-one trillion, one hundred thirty-eight billion, forty million, four hundred ninety-four thousand, six hundred forty-four".