88906065085781 has 4 divisors (see below), whose sum is σ = 89038169195052. Its totient is φ = 88773960976512.

The previous prime is 88906065085771. The next prime is 88906065085841. The reversal of 88906065085781 is 18758056060988.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45580510779556 + 43325554306225 = 6751334^2 + 6582215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-88906065085781 is a prime.

It is a super-2 number, since 2×88906065085781² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88906065085751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66052053626 + ... + 66052054971.

It is an arithmetic number, because the mean of its divisors is an integer number (22259542298763).

Almost surely, 2^{88906065085781} is an apocalyptic number.

It is an amenable number.

88906065085781 is a deficient number, since it is larger than the sum of its proper divisors (132104109271).

88906065085781 is a wasteful number, since it uses less digits than its factorization.

88906065085781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132104109270.

The product of its (nonzero) digits is 232243200, while the sum is 71.

The spelling of 88906065085781 in words is "eighty-eight trillion, nine hundred six billion, sixty-five million, eighty-five thousand, seven hundred eighty-one".