661463320263 has 8 divisors (see below), whose sum is σ = 883261573488. Its totient is φ = 440320306944.

The previous prime is 661463320247. The next prime is 661463320267. The reversal of 661463320263 is 362023364166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661463320263 - 2⁴ = 661463320247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661463320267) 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, 163807620 + ... + 163811657.

It is an arithmetic number, because the mean of its divisors is an integer number (110407696686).

Almost surely, 2^661463320263 is an apocalyptic number.

661463320263 is a deficient number, since it is larger than the sum of its proper divisors (221798253225).

661463320263 is a wasteful number, since it uses less digits than its factorization.

661463320263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327619953.

The product of its (nonzero) digits is 559872, while the sum is 42.

The spelling of 661463320263 in words is "six hundred sixty-one billion, four hundred sixty-three million, three hundred twenty thousand, two hundred sixty-three".