623532651551 has 4 divisors (see below), whose sum is σ = 628083984912. Its totient is φ = 618981318192.

The previous prime is 623532651503. The next prime is 623532651589. The reversal of 623532651551 is 155156235326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 623532651551 - 2¹⁸ = 623532389407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623532651751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2275666475 + ... + 2275666748.

It is an arithmetic number, because the mean of its divisors is an integer number (157020996228).

Almost surely, 2^623532651551 is an apocalyptic number.

623532651551 is a deficient number, since it is larger than the sum of its proper divisors (4551333361).

623532651551 is a wasteful number, since it uses less digits than its factorization.

623532651551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551333360.

The product of its digits is 810000, while the sum is 44.

Adding to 623532651551 its reverse (155156235326), we get a palindrome (778688886877).

The spelling of 623532651551 in words is "six hundred twenty-three billion, five hundred thirty-two million, six hundred fifty-one thousand, five hundred fifty-one".