653661464 has 8 divisors (see below), whose sum is σ = 1225615260. Its totient is φ = 326830728.

The previous prime is 653661461. The next prime is 653661497. The reversal of 653661464 is 464166356.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653661461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40853834 + ... + 40853849.

Almost surely, 2^653661464 is an apocalyptic number.

It is an amenable number.

653661464 is a deficient number, since it is larger than the sum of its proper divisors (571953796).

653661464 is a wasteful number, since it uses less digits than its factorization.

653661464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81707689 (or 81707685 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 653661464 is about 25566.8039457418. The cubic root of 653661464 is about 867.8625753116.

The spelling of 653661464 in words is "six hundred fifty-three million, six hundred sixty-one thousand, four hundred sixty-four".