666736734 has 16 divisors (see below), whose sum is σ = 1334118672. Its totient is φ = 222138048.

The previous prime is 666736729. The next prime is 666736739. The reversal of 666736734 is 437637666.

It is an interprime number because it is at equal distance from previous prime (666736729) and next prime (666736739).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666736739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12889 + ... + 38724.

It is an arithmetic number, because the mean of its divisors is an integer number (83382417).

Almost surely, 2^666736734 is an apocalyptic number.

666736734 is an abundant number, since it is smaller than the sum of its proper divisors (667381938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666736734 is a wasteful number, since it uses less digits than its factorization.

666736734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53771.

The product of its digits is 2286144, while the sum is 48.

The square root of 666736734 is about 25821.2457871420. The cubic root of 666736734 is about 873.6110683910.

The spelling of 666736734 in words is "six hundred sixty-six million, seven hundred thirty-six thousand, seven hundred thirty-four".