155878581971 has 4 divisors (see below), whose sum is σ = 178146950832. Its totient is φ = 133610213112.

The previous prime is 155878581913. The next prime is 155878581979. The reversal of 155878581971 is 179185878551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155878581971 - 2¹⁴ = 155878565587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155878581898 and 155878581907.

It is not an unprimeable number, because it can be changed into a prime (155878581979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11134184420 + ... + 11134184433.

It is an arithmetic number, because the mean of its divisors is an integer number (44536737708).

Almost surely, 2^155878581971 is an apocalyptic number.

155878581971 is a deficient number, since it is larger than the sum of its proper divisors (22268368861).

155878581971 is an equidigital number, since it uses as much as digits as its factorization.

155878581971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22268368860.

The product of its digits is 28224000, while the sum is 65.

The spelling of 155878581971 in words is "one hundred fifty-five billion, eight hundred seventy-eight million, five hundred eighty-one thousand, nine hundred seventy-one".