155220986387 has 2 divisors, whose sum is σ = 155220986388. Its totient is φ = 155220986386.

The previous prime is 155220986363. The next prime is 155220986407. The reversal of 155220986387 is 783689022551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155220986387 - 2²⁶ = 155153877523 is a prime.

It is a super-2 number, since 2×155220986387² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155220086387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77610493193 + 77610493194.

It is an arithmetic number, because the mean of its divisors is an integer number (77610493194).

Almost surely, 2^155220986387 is an apocalyptic number.

155220986387 is a deficient number, since it is larger than the sum of its proper divisors (1).

155220986387 is an equidigital number, since it uses as much as digits as its factorization.

155220986387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 155220986387 in words is "one hundred fifty-five billion, two hundred twenty million, nine hundred eighty-six thousand, three hundred eighty-seven".