155011660661 has 8 divisors (see below), whose sum is σ = 182111601504. Its totient is φ = 130079715120.

The previous prime is 155011660621. The next prime is 155011660667. The reversal of 155011660661 is 166066110551.

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 155011660661 - 2¹⁰ = 155011659637 is a prime.

It is a super-2 number, since 2×155011660661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155011660667) 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, 541998671 + ... + 541998956.

It is an arithmetic number, because the mean of its divisors is an integer number (22763950188).

Almost surely, 2^155011660661 is an apocalyptic number.

155011660661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155011660661 is a deficient number, since it is larger than the sum of its proper divisors (27099940843).

155011660661 is a wasteful number, since it uses less digits than its factorization.

155011660661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083997651.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 155011660661 in words is "one hundred fifty-five billion, eleven million, six hundred sixty thousand, six hundred sixty-one".