155858809963 has 2 divisors, whose sum is σ = 155858809964. Its totient is φ = 155858809962.

The previous prime is 155858809961. The next prime is 155858810071. The reversal of 155858809963 is 369908858551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155858809963 - 2¹ = 155858809961 is a prime.

It is a super-2 number, since 2×155858809963² (a number of 23 digits) contains 22 as substring.

Together with 155858809961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155858809961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77929404981 + 77929404982.

It is an arithmetic number, because the mean of its divisors is an integer number (77929404982).

Almost surely, 2^155858809963 is an apocalyptic number.

155858809963 is a deficient number, since it is larger than the sum of its proper divisors (1).

155858809963 is an equidigital number, since it uses as much as digits as its factorization.

155858809963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312000, while the sum is 67.

The spelling of 155858809963 in words is "one hundred fifty-five billion, eight hundred fifty-eight million, eight hundred nine thousand, nine hundred sixty-three".