661320520145150 has 24 divisors (see below), whose sum is σ = 1230119479594920. Its totient is φ = 264514592547360.

The previous prime is 661320520145027. The next prime is 661320520145179. The reversal of 661320520145150 is 51541025023166.

It is a super-3 number, since 3×661320520145150³ (a number of 45 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661320520145098 and 661320520145107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339406604 + ... + 341349503.

It is an arithmetic number, because the mean of its divisors is an integer number (51254978316455).

Almost surely, 2^{661320520145150} is an apocalyptic number.

661320520145150 is a deficient number, since it is larger than the sum of its proper divisors (568798959449770).

661320520145150 is a wasteful number, since it uses less digits than its factorization.

661320520145150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680775548 (or 680775543 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 661320520145150 in words is "six hundred sixty-one trillion, three hundred twenty billion, five hundred twenty million, one hundred forty-five thousand, one hundred fifty".