61117278394 has 4 divisors (see below), whose sum is σ = 91675917594. Its totient is φ = 30558639196.

The previous prime is 61117278373. The next prime is 61117278403. The reversal of 61117278394 is 49387271116.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49878522225 + 11238756169 = 223335^2 + 106013^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15279319597 + ... + 15279319600.

Almost surely, 2^61117278394 is an apocalyptic number.

61117278394 is a deficient number, since it is larger than the sum of its proper divisors (30558639200).

61117278394 is a wasteful number, since it uses less digits than its factorization.

61117278394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30558639199.

The product of its digits is 508032, while the sum is 49.

The spelling of 61117278394 in words is "sixty-one billion, one hundred seventeen million, two hundred seventy-eight thousand, three hundred ninety-four".