61886572648 has 8 divisors (see below), whose sum is σ = 116037323730. Its totient is φ = 30943286320.

The previous prime is 61886572639. The next prime is 61886572691. The reversal of 61886572648 is 84627568816.

It can be written as a sum of positive squares in only one way, i.e., 59174454564 + 2712118084 = 243258^2 + 52078^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3867910783 + ... + 3867910798.

Almost surely, 2^61886572648 is an apocalyptic number.

It is an amenable number.

61886572648 is a deficient number, since it is larger than the sum of its proper divisors (54150751082).

61886572648 is a wasteful number, since it uses less digits than its factorization.

61886572648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7735821587 (or 7735821583 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 61.

The spelling of 61886572648 in words is "sixty-one billion, eight hundred eighty-six million, five hundred seventy-two thousand, six hundred forty-eight".