69164266081 has 9 divisors (see below), whose sum is σ = 70071894291. Its totient is φ = 68268255744.

The previous prime is 69164266043. The next prime is 69164266099. The reversal of 69164266081 is 18066246196.

The square root of 69164266081 is 262991.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 26975106081 + 42189160000 = 164241^2 + 205400^2 .

It is not a de Polignac number, because 69164266081 - 2¹⁹ = 69163741793 is a prime.

It is a super-2 number, since 2×69164266081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69164266681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20774625 + ... + 20777953.

Almost surely, 2^69164266081 is an apocalyptic number.

69164266081 is the 262991-st square number.

69164266081 is the 131496-th centered octagonal number.

It is an amenable number.

69164266081 is a deficient number, since it is larger than the sum of its proper divisors (907628210).

69164266081 is an frugal number, since it uses more digits than its factorization.

69164266081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6816 (or 3408 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

Multiplying 69164266081 by its sum of digits (49), we get a square (3389049037969 = 1840937²).

The spelling of 69164266081 in words is "sixty-nine billion, one hundred sixty-four million, two hundred sixty-six thousand, eighty-one".