155897798551 has 8 divisors (see below), whose sum is σ = 170104611600. Its totient is φ = 141696699840.

The previous prime is 155897798543. The next prime is 155897798569.

It is a happy number.

155897798551 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155897798551 - 2³ = 155897798543 is a prime.

It is a super-3 number, since 3×155897798551³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155897798501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1371436 + ... + 1480753.

It is an arithmetic number, because the mean of its divisors is an integer number (21263076450).

Almost surely, 2^155897798551 is an apocalyptic number.

155897798551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155897798551 is a deficient number, since it is larger than the sum of its proper divisors (14206813049).

155897798551 is a wasteful number, since it uses less digits than its factorization.

155897798551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857169.

The product of its digits is 158760000, while the sum is 70.

The spelling of 155897798551 in words is "one hundred fifty-five billion, eight hundred ninety-seven million, seven hundred ninety-eight thousand, five hundred fifty-one".