38181216772 has 6 divisors (see below), whose sum is σ = 66817129358. Its totient is φ = 19090608384.

The previous prime is 38181216761. The next prime is 38181216797. The reversal of 38181216772 is 27761218183.

It can be written as a sum of positive squares in only one way, i.e., 21814108416 + 16367108356 = 147696^2 + 127934^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4772652093 + ... + 4772652100.

Almost surely, 2^38181216772 is an apocalyptic number.

It is an amenable number.

38181216772 is a deficient number, since it is larger than the sum of its proper divisors (28635912586).

38181216772 is a wasteful number, since it uses less digits than its factorization.

38181216772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9545304197 (or 9545304195 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The spelling of 38181216772 in words is "thirty-eight billion, one hundred eighty-one million, two hundred sixteen thousand, seven hundred seventy-two".