65120005725731 has 16 divisors (see below), whose sum is σ = 72268551823200. Its totient is φ = 58177936454400.

The previous prime is 65120005725707. The next prime is 65120005725773. The reversal of 65120005725731 is 13752750002156.

It is a cyclic number.

It is not a de Polignac number, because 65120005725731 - 2⁶ = 65120005725667 is a prime.

It is a super-2 number, since 2×65120005725731² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65120005728731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42222596 + ... + 43737713.

It is an arithmetic number, because the mean of its divisors is an integer number (4516784488950).

Almost surely, 2^{65120005725731} is an apocalyptic number.

65120005725731 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

65120005725731 is a deficient number, since it is larger than the sum of its proper divisors (7148546097469).

65120005725731 is a wasteful number, since it uses less digits than its factorization.

65120005725731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85961510.

The product of its (nonzero) digits is 441000, while the sum is 44.

Adding to 65120005725731 its reverse (13752750002156), we get a palindrome (78872755727887).

The spelling of 65120005725731 in words is "sixty-five trillion, one hundred twenty billion, five million, seven hundred twenty-five thousand, seven hundred thirty-one".