61660006001555 has 8 divisors (see below), whose sum is σ = 79683700063632. Its totient is φ = 45533542893408.

The previous prime is 61660006001527. The next prime is 61660006001591. The reversal of 61660006001555 is 55510060006616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61660006001555 is a prime.

It is a super-2 number, since 2×61660006001555² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474307738409 + ... + 474307738538.

It is an arithmetic number, because the mean of its divisors is an integer number (9960462507954).

Almost surely, 2^{61660006001555} is an apocalyptic number.

61660006001555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61660006001555 is a deficient number, since it is larger than the sum of its proper divisors (18023694062077).

61660006001555 is a wasteful number, since it uses less digits than its factorization.

61660006001555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948615476965.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 61660006001555 in words is "sixty-one trillion, six hundred sixty billion, six million, one thousand, five hundred fifty-five".