61557709476 has 12 divisors (see below), whose sum is σ = 143634655472. Its totient is φ = 20519236488.

The previous prime is 61557709469. The next prime is 61557709541. The reversal of 61557709476 is 67490775516.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2564904550 + ... + 2564904573.

Almost surely, 2^61557709476 is an apocalyptic number.

It is an amenable number.

61557709476 is an abundant number, since it is smaller than the sum of its proper divisors (82076945996).

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

61557709476 is a wasteful number, since it uses less digits than its factorization.

61557709476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129809130 (or 5129809128 counting only the distinct ones).

The product of its (nonzero) digits is 11113200, while the sum is 57.

The spelling of 61557709476 in words is "sixty-one billion, five hundred fifty-seven million, seven hundred nine thousand, four hundred seventy-six".