66261025623 has 16 divisors (see below), whose sum is σ = 95204229120. Its totient is φ = 40750219104.

The previous prime is 66261025601. The next prime is 66261025631. The reversal of 66261025623 is 32652016266.

It is not a de Polignac number, because 66261025623 - 2⁵ = 66261025591 is a prime.

It is a super-2 number, since 2×66261025623² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66261025123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 474903 + ... + 598376.

It is an arithmetic number, because the mean of its divisors is an integer number (5950264320).

Almost surely, 2^66261025623 is an apocalyptic number.

66261025623 is a deficient number, since it is larger than the sum of its proper divisors (28943203497).

66261025623 is a wasteful number, since it uses less digits than its factorization.

66261025623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074878.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 66261025623 in words is "sixty-six billion, two hundred sixty-one million, twenty-five thousand, six hundred twenty-three".