145205521451 has 2 divisors, whose sum is σ = 145205521452. Its totient is φ = 145205521450.

The previous prime is 145205521399. The next prime is 145205521459. The reversal of 145205521451 is 154125502541.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145205521451 is a prime.

It is a super-2 number, since 2×145205521451² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (145205521459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72602760725 + 72602760726.

It is an arithmetic number, because the mean of its divisors is an integer number (72602760726).

Almost surely, 2^145205521451 is an apocalyptic number.

145205521451 is a deficient number, since it is larger than the sum of its proper divisors (1).

145205521451 is an equidigital number, since it uses as much as digits as its factorization.

145205521451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40000, while the sum is 35.

The spelling of 145205521451 in words is "one hundred forty-five billion, two hundred five million, five hundred twenty-one thousand, four hundred fifty-one".