97781661429 has 16 divisors (see below), whose sum is σ = 139988995200. Its totient is φ = 60489067520.

The previous prime is 97781661401. The next prime is 97781661431. The reversal of 97781661429 is 92416618779.

It is a cyclic number.

It is not a de Polignac number, because 97781661429 - 2¹³ = 97781653237 is a prime.

It is a super-2 number, since 2×97781661429² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97781661449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13498404 + ... + 13505645.

It is an arithmetic number, because the mean of its divisors is an integer number (8749312200).

Almost surely, 2^97781661429 is an apocalyptic number.

It is an amenable number.

97781661429 is a deficient number, since it is larger than the sum of its proper divisors (42207333771).

97781661429 is a wasteful number, since it uses less digits than its factorization.

97781661429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27004140.

The product of its digits is 9144576, while the sum is 60.

The spelling of 97781661429 in words is "ninety-seven billion, seven hundred eighty-one million, six hundred sixty-one thousand, four hundred twenty-nine".