61654646667 has 16 divisors (see below), whose sum is σ = 83155468032. Its totient is φ = 40631182560.

The previous prime is 61654646617. The next prime is 61654646723. The reversal of 61654646667 is 76664645616.

It is not a de Polignac number, because 61654646667 - 2⁸ = 61654646411 is a prime.

It is a super-2 number, since 2×61654646667² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61654646617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249273 + ... + 430634.

It is an arithmetic number, because the mean of its divisors is an integer number (5197216752).

Almost surely, 2^61654646667 is an apocalyptic number.

61654646667 is a deficient number, since it is larger than the sum of its proper divisors (21500821365).

61654646667 is a wasteful number, since it uses less digits than its factorization.

61654646667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680258.

The product of its digits is 26127360, while the sum is 57.

The spelling of 61654646667 in words is "sixty-one billion, six hundred fifty-four million, six hundred forty-six thousand, six hundred sixty-seven".