61256550540 has 48 divisors (see below), whose sum is σ = 171996168960. Its totient is φ = 16289572800.

The previous prime is 61256550503. The next prime is 61256550547. The reversal of 61256550540 is 4505565216.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61256550547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1400386 + ... + 1443465.

It is an arithmetic number, because the mean of its divisors is an integer number (3583253520).

Almost surely, 2^61256550540 is an apocalyptic number.

61256550540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61256550540 is an abundant number, since it is smaller than the sum of its proper divisors (110739618420).

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

61256550540 is a wasteful number, since it uses less digits than its factorization.

61256550540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844222 (or 2844220 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 61256550540 in words is "sixty-one billion, two hundred fifty-six million, five hundred fifty thousand, five hundred forty".