64491001651 has 2 divisors, whose sum is σ = 64491001652. Its totient is φ = 64491001650.

The previous prime is 64491001609. The next prime is 64491001703. The reversal of 64491001651 is 15610019446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64491001651 - 2³³ = 55901067059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64491001651.

It is not a weakly prime, because it can be changed into another prime (64491001951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32245500825 + 32245500826.

It is an arithmetic number, because the mean of its divisors is an integer number (32245500826).

Almost surely, 2^64491001651 is an apocalyptic number.

64491001651 is a deficient number, since it is larger than the sum of its proper divisors (1).

64491001651 is an equidigital number, since it uses as much as digits as its factorization.

64491001651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 64491001651 in words is "sixty-four billion, four hundred ninety-one million, one thousand, six hundred fifty-one".