20401551571 has 2 divisors, whose sum is σ = 20401551572. Its totient is φ = 20401551570.

The previous prime is 20401551529. The next prime is 20401551589. The reversal of 20401551571 is 17515510402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20401551571 - 2¹⁵ = 20401518803 is a prime.

It is not a weakly prime, because it can be changed into another prime (20401558571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200775785 + 10200775786.

It is an arithmetic number, because the mean of its divisors is an integer number (10200775786).

Almost surely, 2^20401551571 is an apocalyptic number.

20401551571 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401551571 is an equidigital number, since it uses as much as digits as its factorization.

20401551571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 31.

The spelling of 20401551571 in words is "twenty billion, four hundred one million, five hundred fifty-one thousand, five hundred seventy-one".