661413155326 has 16 divisors (see below), whose sum is σ = 1236928498560. Its totient is φ = 257693437080.

The previous prime is 661413155323. The next prime is 661413155329. The reversal of 661413155326 is 623551314166.

It is an interprime number because it is at equal distance from previous prime (661413155323) and next prime (661413155329).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661413155321) 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, 2147445156 + ... + 2147445463.

It is an arithmetic number, because the mean of its divisors is an integer number (77308031160).

Almost surely, 2^661413155326 is an apocalyptic number.

661413155326 is a deficient number, since it is larger than the sum of its proper divisors (575515343234).

661413155326 is a wasteful number, since it uses less digits than its factorization.

661413155326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4294890639.

The product of its digits is 388800, while the sum is 43.

The spelling of 661413155326 in words is "six hundred sixty-one billion, four hundred thirteen million, one hundred fifty-five thousand, three hundred twenty-six".