661156452263010 has 64 divisors (see below), whose sum is σ = 1731030326135424. Its totient is φ = 160280118374400.

The previous prime is 661156452262927. The next prime is 661156452263149. The reversal of 661156452263010 is 10362254651166.

It is a happy number.

661156452263010 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 362215362 + ... + 364036098.

It is an arithmetic number, because the mean of its divisors is an integer number (27047348845866).

Almost surely, 2^{661156452263010} is an apocalyptic number.

661156452263010 is an abundant number, since it is smaller than the sum of its proper divisors (1069873873872414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661156452263010 is a wasteful number, since it uses less digits than its factorization.

661156452263010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921139.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 661156452263010 in words is "six hundred sixty-one trillion, one hundred fifty-six billion, four hundred fifty-two million, two hundred sixty-three thousand, ten".