661012353 has 16 divisors (see below), whose sum is σ = 979810240. Its totient is φ = 440435232.

The previous prime is 661012351. The next prime is 661012361. The reversal of 661012353 is 353210166.

661012353 is a `hidden beast` number, since 6 + 610 + 12 + 35 + 3 = 666.

It is not a de Polignac number, because 661012353 - 2¹ = 661012351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661012351) 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, 53925 + ... + 65037.

It is an arithmetic number, because the mean of its divisors is an integer number (61238140).

Almost surely, 2^661012353 is an apocalyptic number.

It is an amenable number.

661012353 is a deficient number, since it is larger than the sum of its proper divisors (318797887).

661012353 is a wasteful number, since it uses less digits than its factorization.

661012353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13325 (or 13319 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 661012353 is about 25710.1605012493. The cubic root of 661012353 is about 871.1037003006.

The spelling of 661012353 in words is "six hundred sixty-one million, twelve thousand, three hundred fifty-three".