61051646920 has 32 divisors (see below), whose sum is σ = 149854043520. Its totient is φ = 22200598720.

The previous prime is 61051646861. The next prime is 61051646923. The reversal of 61051646920 is 2964615016.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (61051646923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69376432 + ... + 69377311.

It is an arithmetic number, because the mean of its divisors is an integer number (4682938860).

Almost surely, 2^61051646920 is an apocalyptic number.

It is an amenable number.

61051646920 is an abundant number, since it is smaller than the sum of its proper divisors (88802396600).

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

61051646920 is a wasteful number, since it uses less digits than its factorization.

61051646920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138753765 (or 138753761 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 61051646920 in words is "sixty-one billion, fifty-one million, six hundred forty-six thousand, nine hundred twenty".