61506422738 has 8 divisors (see below), whose sum is σ = 93076091388. Its totient is φ = 30481058944.

The previous prime is 61506422737. The next prime is 61506422819. The reversal of 61506422738 is 83722460516.

It can be written as a sum of positive squares in 2 ways, for example, as 36135348649 + 25371074089 = 190093^2 + 159283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (61506422737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136075931 + ... + 136076382.

Almost surely, 2^61506422738 is an apocalyptic number.

61506422738 is a deficient number, since it is larger than the sum of its proper divisors (31569668650).

61506422738 is a wasteful number, since it uses less digits than its factorization.

61506422738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272152428.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 61506422738 in words is "sixty-one billion, five hundred six million, four hundred twenty-two thousand, seven hundred thirty-eight".