155766667551 has 24 divisors (see below), whose sum is σ = 231175875840. Its totient is φ = 93209035920.

The previous prime is 155766667549. The next prime is 155766667579.

155766667551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 155766667551 - 2¹ = 155766667549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155766667951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2687205 + ... + 2744558.

It is an arithmetic number, because the mean of its divisors is an integer number (9632328160).

Almost surely, 2^155766667551 is an apocalyptic number.

155766667551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155766667551 is a deficient number, since it is larger than the sum of its proper divisors (75409208289).

155766667551 is a wasteful number, since it uses less digits than its factorization.

155766667551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5431867 (or 5431856 counting only the distinct ones).

The product of its digits is 39690000, while the sum is 60.

The spelling of 155766667551 in words is "one hundred fifty-five billion, seven hundred sixty-six million, six hundred sixty-seven thousand, five hundred fifty-one".