71638042551 has 16 divisors (see below), whose sum is σ = 101364390144. Its totient is φ = 44847880064.

The previous prime is 71638042543. The next prime is 71638042559. The reversal of 71638042551 is 15524083617.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (71638042543) and next prime (71638042559).

It is not a de Polignac number, because 71638042551 - 2³ = 71638042543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71638042559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1562811 + ... + 1607996.

It is an arithmetic number, because the mean of its divisors is an integer number (6335274384).

Almost surely, 2^71638042551 is an apocalyptic number.

71638042551 is a deficient number, since it is larger than the sum of its proper divisors (29726347593).

71638042551 is a wasteful number, since it uses less digits than its factorization.

71638042551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171270.

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 71638042551 in words is "seventy-one billion, six hundred thirty-eight million, forty-two thousand, five hundred fifty-one".