154720435897 has 2 divisors, whose sum is σ = 154720435898. Its totient is φ = 154720435896.

The previous prime is 154720435811. The next prime is 154720435901. The reversal of 154720435897 is 798534027451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146921956416 + 7798479481 = 383304^2 + 88309^2 .

It is a cyclic number.

It is not a de Polignac number, because 154720435897 - 2¹⁹ = 154719911609 is a prime.

It is not a weakly prime, because it can be changed into another prime (154720435997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77360217948 + 77360217949.

It is an arithmetic number, because the mean of its divisors is an integer number (77360217949).

Almost surely, 2^154720435897 is an apocalyptic number.

It is an amenable number.

154720435897 is a deficient number, since it is larger than the sum of its proper divisors (1).

154720435897 is an equidigital number, since it uses as much as digits as its factorization.

154720435897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 55.

The spelling of 154720435897 in words is "one hundred fifty-four billion, seven hundred twenty million, four hundred thirty-five thousand, eight hundred ninety-seven".