20401153979 has 2 divisors, whose sum is σ = 20401153980. Its totient is φ = 20401153978.

The previous prime is 20401153937. The next prime is 20401154023. The reversal of 20401153979 is 97935110402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20401153979 is a prime.

It is not a weakly prime, because it can be changed into another prime (20401153919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200576989 + 10200576990.

It is an arithmetic number, because the mean of its divisors is an integer number (10200576990).

Almost surely, 2^20401153979 is an apocalyptic number.

20401153979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401153979 is an equidigital number, since it uses as much as digits as its factorization.

20401153979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 20401153979 in words is "twenty billion, four hundred one million, one hundred fifty-three thousand, nine hundred seventy-nine".