401665653 has 6 divisors (see below), whose sum is σ = 580183734. Its totient is φ = 267777096.

The previous prime is 401665597. The next prime is 401665661. The reversal of 401665653 is 356566104.

It can be written as a sum of positive squares in only one way, i.e., 205721649 + 195944004 = 14343^2 + 13998^2 .

It is not a de Polignac number, because 401665653 - 2⁹ = 401665141 is a prime.

It is a super-2 number, since 2×401665653² = 322670593599832818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401665153) 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 5 ways as a sum of consecutive naturals, for example, 22314750 + ... + 22314767.

It is an arithmetic number, because the mean of its divisors is an integer number (96697289).

Almost surely, 2^401665653 is an apocalyptic number.

It is an amenable number.

401665653 is a deficient number, since it is larger than the sum of its proper divisors (178518081).

401665653 is a wasteful number, since it uses less digits than its factorization.

401665653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44629523 (or 44629520 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 401665653 is about 20041.5980650247. The cubic root of 401665653 is about 737.8276031093.

The spelling of 401665653 in words is "four hundred one million, six hundred sixty-five thousand, six hundred fifty-three".