661153411 has 4 divisors (see below), whose sum is σ = 661292424. Its totient is φ = 661014400.

The previous prime is 661153403. The next prime is 661153439. The reversal of 661153411 is 114351166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661153411 - 2³ = 661153403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661153411.

It is not an unprimeable number, because it can be changed into a prime (661153711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62110 + ... + 71971.

It is an arithmetic number, because the mean of its divisors is an integer number (165323106).

Almost surely, 2^661153411 is an apocalyptic number.

661153411 is a deficient number, since it is larger than the sum of its proper divisors (139013).

661153411 is a wasteful number, since it uses less digits than its factorization.

661153411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139012.

The product of its digits is 2160, while the sum is 28.

The square root of 661153411 is about 25712.9035894432. The cubic root of 661153411 is about 871.1656595090.

The spelling of 661153411 in words is "six hundred sixty-one million, one hundred fifty-three thousand, four hundred eleven".