661611056758 has 16 divisors (see below), whose sum is σ = 1011611418336. Its totient is φ = 324413053120.

The previous prime is 661611056747. The next prime is 661611056791. The reversal of 661611056758 is 857650116166.

It is a happy number.

661611056758 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1221298 + ... + 1677733.

It is an arithmetic number, because the mean of its divisors is an integer number (63225713646).

Almost surely, 2^661611056758 is an apocalyptic number.

661611056758 is a deficient number, since it is larger than the sum of its proper divisors (350000361578).

661611056758 is a wasteful number, since it uses less digits than its factorization.

661611056758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901239.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 661611056758 in words is "six hundred sixty-one billion, six hundred eleven million, fifty-six thousand, seven hundred fifty-eight".