1651406399987 has 2 divisors, whose sum is σ = 1651406399988. Its totient is φ = 1651406399986.

The previous prime is 1651406399971. The next prime is 1651406400019. The reversal of 1651406399987 is 7899936041561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1651406399987 - 2⁴ = 1651406399971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1651406399927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825703199993 + 825703199994.

It is an arithmetic number, because the mean of its divisors is an integer number (825703199994).

Almost surely, 2^{1651406399987} is an apocalyptic number.

1651406399987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651406399987 is an equidigital number, since it uses as much as digits as its factorization.

1651406399987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88179840, while the sum is 68.

The spelling of 1651406399987 in words is "one trillion, six hundred fifty-one billion, four hundred six million, three hundred ninety-nine thousand, nine hundred eighty-seven".