61955618620 has 72 divisors (see below), whose sum is σ = 154868568624. Its totient is φ = 20747913984.

The previous prime is 61955618617. The next prime is 61955618689. The reversal of 61955618620 is 2681655916.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 692977 + ... + 777256.

It is an arithmetic number, because the mean of its divisors is an integer number (2150952342).

Almost surely, 2^61955618620 is an apocalyptic number.

It is an amenable number.

61955618620 is an abundant number, since it is smaller than the sum of its proper divisors (92912950004).

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

61955618620 is a wasteful number, since it uses less digits than its factorization.

61955618620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470299 (or 1470290 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 61955618620 in words is "sixty-one billion, nine hundred fifty-five million, six hundred eighteen thousand, six hundred twenty".