667474407533661 has 32 divisors (see below), whose sum is σ = 1142966209566720. Its totient is φ = 336766829598144.

The previous prime is 667474407533653. The next prime is 667474407533699. The reversal of 667474407533661 is 166335704474766.

It is a happy number.

It is not a de Polignac number, because 667474407533661 - 2³ = 667474407533653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667474407533161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53151324151 + ... + 53151336708.

It is an arithmetic number, because the mean of its divisors is an integer number (35717694048960).

Almost surely, 2^{667474407533661} is an apocalyptic number.

It is an amenable number.

667474407533661 is a deficient number, since it is larger than the sum of its proper divisors (475491802033059).

667474407533661 is a wasteful number, since it uses less digits than its factorization.

667474407533661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106302660905.

The product of its (nonzero) digits is 1280240640, while the sum is 69.

The spelling of 667474407533661 in words is "six hundred sixty-seven trillion, four hundred seventy-four billion, four hundred seven million, five hundred thirty-three thousand, six hundred sixty-one".