151818550021 has 2 divisors, whose sum is σ = 151818550022. Its totient is φ = 151818550020.

The previous prime is 151818549991. The next prime is 151818550043. The reversal of 151818550021 is 120055818151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87042700900 + 64775849121 = 295030^2 + 254511^2 .

It is a cyclic number.

It is not a de Polignac number, because 151818550021 - 2⁵ = 151818549989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151818559021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75909275010 + 75909275011.

It is an arithmetic number, because the mean of its divisors is an integer number (75909275011).

Almost surely, 2^151818550021 is an apocalyptic number.

It is an amenable number.

151818550021 is a deficient number, since it is larger than the sum of its proper divisors (1).

151818550021 is an equidigital number, since it uses as much as digits as its factorization.

151818550021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 37.

The spelling of 151818550021 in words is "one hundred fifty-one billion, eight hundred eighteen million, five hundred fifty thousand, twenty-one".