61111721670 has 16 divisors (see below), whose sum is σ = 146668132080. Its totient is φ = 16296459104.

The previous prime is 61111721633. The next prime is 61111721681. The reversal of 61111721670 is 7612711116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018528665 + ... + 1018528724.

It is an arithmetic number, because the mean of its divisors is an integer number (9166758255).

Almost surely, 2^61111721670 is an apocalyptic number.

61111721670 is an abundant number, since it is smaller than the sum of its proper divisors (85556410410).

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

61111721670 is a wasteful number, since it uses less digits than its factorization.

61111721670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037057399.

The product of its (nonzero) digits is 3528, while the sum is 33.

The spelling of 61111721670 in words is "sixty-one billion, one hundred eleven million, seven hundred twenty-one thousand, six hundred seventy".