661358433 has 16 divisors (see below), whose sum is σ = 927438336. Its totient is φ = 418629120.

The previous prime is 661358431. The next prime is 661358483. The reversal of 661358433 is 334853166.

It is not a de Polignac number, because 661358433 - 2¹ = 661358431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661358391 and 661358400.

It is not an unprimeable number, because it can be changed into a prime (661358431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62160 + ... + 72017.

It is an arithmetic number, because the mean of its divisors is an integer number (57964896).

Almost surely, 2^661358433 is an apocalyptic number.

It is an amenable number.

661358433 is a deficient number, since it is larger than the sum of its proper divisors (266079903).

661358433 is a wasteful number, since it uses less digits than its factorization.

661358433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134264.

The product of its digits is 155520, while the sum is 39.

The square root of 661358433 is about 25716.8900335947. The cubic root of 661358433 is about 871.2556989583.

The spelling of 661358433 in words is "six hundred sixty-one million, three hundred fifty-eight thousand, four hundred thirty-three".