661332016142145 has 32 divisors (see below), whose sum is σ = 1213627212426240. Its totient is φ = 341332653490560.

The previous prime is 661332016142131. The next prime is 661332016142179. The reversal of 661332016142145 is 541241610233166.

661332016142145 is a `hidden beast` number, since 6 + 6 + 1 + 3 + 3 + 2 + 0 + 1 + 614 + 21 + 4 + 5 = 666.

It is not a de Polignac number, because 661332016142145 - 2⁵ = 661332016142113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 661332016142145.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79012184124 + ... + 79012192493.

It is an arithmetic number, because the mean of its divisors is an integer number (37925850388320).

Almost surely, 2^{661332016142145} is an apocalyptic number.

It is an amenable number.

661332016142145 is a deficient number, since it is larger than the sum of its proper divisors (552295196284095).

661332016142145 is a wasteful number, since it uses less digits than its factorization.

661332016142145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158024376662 (or 158024376656 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 661332016142145 in words is "six hundred sixty-one trillion, three hundred thirty-two billion, sixteen million, one hundred forty-two thousand, one hundred forty-five".