61901893604 has 6 divisors (see below), whose sum is σ = 108328313814. Its totient is φ = 30950946800.

The previous prime is 61901893597. The next prime is 61901893631. The reversal of 61901893604 is 40639810916.

It can be written as a sum of positive squares in only one way, i.e., 50877313600 + 11024580004 = 225560^2 + 104998^2 .

It is a super-2 number, since 2×61901893604² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7737736697 + ... + 7737736704.

It is an arithmetic number, because the mean of its divisors is an integer number (18054718969).

Almost surely, 2^61901893604 is an apocalyptic number.

It is an amenable number.

61901893604 is a deficient number, since it is larger than the sum of its proper divisors (46426420210).

61901893604 is a wasteful number, since it uses less digits than its factorization.

61901893604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15475473405 (or 15475473403 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 61901893604 in words is "sixty-one billion, nine hundred one million, eight hundred ninety-three thousand, six hundred four".