638151361947 has 96 divisors (see below), whose sum is σ = 1055470141440. Its totient is φ = 367771631040.

The previous prime is 638151361927. The next prime is 638151361963. The reversal of 638151361947 is 749163151836.

638151361947 is a `hidden beast` number, since 6 + 3 + 8 + 1 + 5 + 13 + 619 + 4 + 7 = 666.

It is not a de Polignac number, because 638151361947 - 2⁷ = 638151361819 is a prime.

It is a super-3 number, since 3×638151361947³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638151361893 and 638151361902.

It is not an unprimeable number, because it can be changed into a prime (638151361927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 362791254 + ... + 362793012.

It is an arithmetic number, because the mean of its divisors is an integer number (10994480640).

Almost surely, 2^638151361947 is an apocalyptic number.

638151361947 is a deficient number, since it is larger than the sum of its proper divisors (417318779493).

638151361947 is a wasteful number, since it uses less digits than its factorization.

638151361947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645 (or 2642 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 638151361947 in words is "six hundred thirty-eight billion, one hundred fifty-one million, three hundred sixty-one thousand, nine hundred forty-seven".