154961840993 has 2 divisors, whose sum is σ = 154961840994. Its totient is φ = 154961840992.

The previous prime is 154961840959. The next prime is 154961841019. The reversal of 154961840993 is 399048169451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134148585169 + 20813255824 = 366263^2 + 144268^2 .

It is a cyclic number.

It is not a de Polignac number, because 154961840993 - 2²² = 154957646689 is a prime.

It is not a weakly prime, because it can be changed into another prime (154961840923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77480920496 + 77480920497.

It is an arithmetic number, because the mean of its divisors is an integer number (77480920497).

Almost surely, 2^154961840993 is an apocalyptic number.

It is an amenable number.

154961840993 is a deficient number, since it is larger than the sum of its proper divisors (1).

154961840993 is an equidigital number, since it uses as much as digits as its factorization.

154961840993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 154961840993 in words is "one hundred fifty-four billion, nine hundred sixty-one million, eight hundred forty thousand, nine hundred ninety-three".