661126027654 has 32 divisors (see below), whose sum is σ = 1054819190016. Its totient is φ = 310134079200.

The previous prime is 661126027651. The next prime is 661126027691. The reversal of 661126027654 is 456720621166.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661126027651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167832 + ... + 1162075.

It is an arithmetic number, because the mean of its divisors is an integer number (32963099688).

Almost surely, 2^661126027654 is an apocalyptic number.

661126027654 is a deficient number, since it is larger than the sum of its proper divisors (393693162362).

661126027654 is a wasteful number, since it uses less digits than its factorization.

661126027654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330140.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 661126027654 in words is "six hundred sixty-one billion, one hundred twenty-six million, twenty-seven thousand, six hundred fifty-four".