64162537381 has 4 divisors (see below), whose sum is σ = 66375038700. Its totient is φ = 61950036064.

The previous prime is 64162537379. The next prime is 64162537403. The reversal of 64162537381 is 18373526146.

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 32989456900 + 31173080481 = 181630^2 + 176559^2 .

It is a cyclic number.

It is not a de Polignac number, because 64162537381 - 2¹ = 64162537379 is a prime.

It is a super-2 number, since 2×64162537381² (a number of 22 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 (64162537301) 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, 1106250616 + ... + 1106250673.

It is an arithmetic number, because the mean of its divisors is an integer number (16593759675).

Almost surely, 2^64162537381 is an apocalyptic number.

It is an amenable number.

64162537381 is a deficient number, since it is larger than the sum of its proper divisors (2212501319).

64162537381 is a wasteful number, since it uses less digits than its factorization.

64162537381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212501318.

The product of its digits is 725760, while the sum is 46.

The spelling of 64162537381 in words is "sixty-four billion, one hundred sixty-two million, five hundred thirty-seven thousand, three hundred eighty-one".