126566631 has 40 divisors (see below), whose sum is σ = 202222944. Its totient is φ = 78693120.

The previous prime is 126566621. The next prime is 126566639. The reversal of 126566631 is 136665621.

It is not a de Polignac number, because 126566631 - 2⁵ = 126566599 is a prime.

It is a super-2 number, since 2×126566631² = 32038224165380322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126566639) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 75555 + ... + 77211.

Almost surely, 2^126566631 is an apocalyptic number.

126566631 is a deficient number, since it is larger than the sum of its proper divisors (75656313).

126566631 is a wasteful number, since it uses less digits than its factorization.

126566631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733 (or 1724 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 126566631 is about 11250.1835985018. The cubic root of 126566631 is about 502.0801750751.

It can be divided in two parts, 1265 and 66631, that added together give a triangular number (67896 = T₃₆₈).

The spelling of 126566631 in words is "one hundred twenty-six million, five hundred sixty-six thousand, six hundred thirty-one".