16461637557 has 8 divisors (see below), whose sum is σ = 23239958976. Its totient is φ = 10328870592.

The previous prime is 16461637547. The next prime is 16461637559. The reversal of 16461637557 is 75573616461.

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

It is not a de Polignac number, because 16461637557 - 2¹⁰ = 16461636533 is a prime.

It is a super-2 number, since 2×16461637557² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 322777207 = 16461637557 / (1 + 6 + 4 + 6 + 1 + 6 + 3 + 7 + 5 + 5 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16461637559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161388553 + ... + 161388654.

It is an arithmetic number, because the mean of its divisors is an integer number (2904994872).

Almost surely, 2^16461637557 is an apocalyptic number.

16461637557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16461637557 is a deficient number, since it is larger than the sum of its proper divisors (6778321419).

16461637557 is a wasteful number, since it uses less digits than its factorization.

16461637557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322777227.

The product of its digits is 3175200, while the sum is 51.

The spelling of 16461637557 in words is "sixteen billion, four hundred sixty-one million, six hundred thirty-seven thousand, five hundred fifty-seven".