901638794523 has 6 divisors (see below), whose sum is σ = 1202187252252. Its totient is φ = 601091433240.

The previous prime is 901638794503. The next prime is 901638794557. The reversal of 901638794523 is 325497836109.

It is not a de Polignac number, because 901638794523 - 2²² = 901634600219 is a prime.

It is a super-2 number, since 2×901638794523² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (901638794503) 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 5 ways as a sum of consecutive naturals, for example, 1370553 + ... + 1918773.

It is an arithmetic number, because the mean of its divisors is an integer number (200364542042).

It is a 3-persistent number, because k⋅901638794523 is pandigital for 1 ≤ k ≤ 3, but not for k = 4.

Almost surely, 2^901638794523 is an apocalyptic number.

901638794523 is a deficient number, since it is larger than the sum of its proper divisors (300548457729).

901638794523 is an frugal number, since it uses more digits than its factorization.

901638794523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096445 (or 548224 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 901638794523 in words is "nine hundred one billion, six hundred thirty-eight million, seven hundred ninety-four thousand, five hundred twenty-three".