10202988478691 has 2 divisors, whose sum is σ = 10202988478692. Its totient is φ = 10202988478690.

The previous prime is 10202988478679. The next prime is 10202988478741. The reversal of 10202988478691 is 19687488920201.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10202988478691 is a prime.

It is a super-2 number, since 2×10202988478691² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10202988478091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101494239345 + 5101494239346.

It is an arithmetic number, because the mean of its divisors is an integer number (5101494239346).

Almost surely, 2^{10202988478691} is an apocalyptic number.

10202988478691 is a deficient number, since it is larger than the sum of its proper divisors (1).

10202988478691 is an equidigital number, since it uses as much as digits as its factorization.

10202988478691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27869184, while the sum is 65.

The spelling of 10202988478691 in words is "ten trillion, two hundred two billion, nine hundred eighty-eight million, four hundred seventy-eight thousand, six hundred ninety-one".