105104991557 has 2 divisors, whose sum is σ = 105104991558. Its totient is φ = 105104991556.

The previous prime is 105104991527. The next prime is 105104991619. The reversal of 105104991557 is 755199401501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59377018276 + 45727973281 = 243674^2 + 213841^2 .

It is a cyclic number.

It is not a de Polignac number, because 105104991557 - 2¹² = 105104987461 is a prime.

It is a super-2 number, since 2×105104991557² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105104991527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52552495778 + 52552495779.

It is an arithmetic number, because the mean of its divisors is an integer number (52552495779).

Almost surely, 2^105104991557 is an apocalyptic number.

It is an amenable number.

105104991557 is a deficient number, since it is larger than the sum of its proper divisors (1).

105104991557 is an equidigital number, since it uses as much as digits as its factorization.

105104991557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 283500, while the sum is 47.

The spelling of 105104991557 in words is "one hundred five billion, one hundred four million, nine hundred ninety-one thousand, five hundred fifty-seven".