61680945790 has 32 divisors (see below), whose sum is σ = 113275565856. Its totient is φ = 24173685120.

The previous prime is 61680945787. The next prime is 61680945797. The reversal of 61680945790 is 9754908616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61680945797) 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, 309105 + ... + 467875.

It is an arithmetic number, because the mean of its divisors is an integer number (3539861433).

Almost surely, 2^61680945790 is an apocalyptic number.

61680945790 is a deficient number, since it is larger than the sum of its proper divisors (51594620066).

61680945790 is a wasteful number, since it uses less digits than its factorization.

61680945790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159564.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 61680945790 in words is "sixty-one billion, six hundred eighty million, nine hundred forty-five thousand, seven hundred ninety".