65193091537 has 4 divisors (see below), whose sum is σ = 74506390336. Its totient is φ = 55879792740.

The previous prime is 65193091511. The next prime is 65193091559. The reversal of 65193091537 is 73519039156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65193091537 - 2¹⁵ = 65193058769 is a prime.

It is a super-2 number, since 2×65193091537² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65193091507) 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, 4656649389 + ... + 4656649402.

It is an arithmetic number, because the mean of its divisors is an integer number (18626597584).

Almost surely, 2^65193091537 is an apocalyptic number.

It is an amenable number.

65193091537 is a deficient number, since it is larger than the sum of its proper divisors (9313298799).

65193091537 is an equidigital number, since it uses as much as digits as its factorization.

65193091537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9313298798.

The product of its (nonzero) digits is 765450, while the sum is 49.

The spelling of 65193091537 in words is "sixty-five billion, one hundred ninety-three million, ninety-one thousand, five hundred thirty-seven".