661274121 has 16 divisors (see below), whose sum is σ = 896007168. Its totient is φ = 433712400.

The previous prime is 661274093. The next prime is 661274137. The reversal of 661274121 is 121472166.

661274121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661274121 - 2⁷ = 661273993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661274021) 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, 205636 + ... + 208826.

It is an arithmetic number, because the mean of its divisors is an integer number (56000448).

Almost surely, 2^661274121 is an apocalyptic number.

It is an amenable number.

661274121 is a deficient number, since it is larger than the sum of its proper divisors (234733047).

661274121 is a wasteful number, since it uses less digits than its factorization.

661274121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292.

The product of its digits is 4032, while the sum is 30.

The square root of 661274121 is about 25715.2507473678. The cubic root of 661274121 is about 871.2186739360.

The spelling of 661274121 in words is "six hundred sixty-one million, two hundred seventy-four thousand, one hundred twenty-one".