61447782475 has 24 divisors (see below), whose sum is σ = 77302293408. Its totient is φ = 48444614400.

The previous prime is 61447782443. The next prime is 61447782509. The reversal of 61447782475 is 57428774416.

It is not a de Polignac number, because 61447782475 - 2⁵ = 61447782443 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4958487 + ... + 4970863.

It is an arithmetic number, because the mean of its divisors is an integer number (3220928892).

Almost surely, 2^61447782475 is an apocalyptic number.

61447782475 is a deficient number, since it is larger than the sum of its proper divisors (15854510933).

61447782475 is a wasteful number, since it uses less digits than its factorization.

61447782475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15255 (or 15250 counting only the distinct ones).

The product of its digits is 10536960, while the sum is 55.

The spelling of 61447782475 in words is "sixty-one billion, four hundred forty-seven million, seven hundred eighty-two thousand, four hundred seventy-five".