61401520154240 has 128 divisors (see below), whose sum is σ = 177625826380800. Its totient is φ = 19813599756288.

The previous prime is 61401520154231. The next prime is 61401520154281. The reversal of 61401520154240 is 4245102510416.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 61401520154240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403032560 + ... + 403184879.

It is an arithmetic number, because the mean of its divisors is an integer number (1387701768600).

Almost surely, 2^{61401520154240} is an apocalyptic number.

It is an amenable number.

61401520154240 is an abundant number, since it is smaller than the sum of its proper divisors (116224306226560).

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

61401520154240 is a wasteful number, since it uses less digits than its factorization.

61401520154240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806217482 (or 806217470 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

Adding to 61401520154240 its reverse (4245102510416), we get a palindrome (65646622664656).

The spelling of 61401520154240 in words is "sixty-one trillion, four hundred one billion, five hundred twenty million, one hundred fifty-four thousand, two hundred forty".