7791239061645 has 32 divisors (see below), whose sum is σ = 13425040578432. Its totient is φ = 3835647965952.

The previous prime is 7791239061643. The next prime is 7791239061647. The reversal of 7791239061645 is 5461609321977.

It is an interprime number because it is at equal distance from previous prime (7791239061643) and next prime (7791239061647).

It is not a de Polignac number, because 7791239061645 - 2¹ = 7791239061643 is a prime.

It is a super-3 number, since 3×7791239061645³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7791239061643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32654199 + ... + 32891931.

It is an arithmetic number, because the mean of its divisors is an integer number (419532518076).

Almost surely, 2^{7791239061645} is an apocalyptic number.

It is an amenable number.

7791239061645 is a deficient number, since it is larger than the sum of its proper divisors (5633801516787).

7791239061645 is a wasteful number, since it uses less digits than its factorization.

7791239061645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405821.

The product of its (nonzero) digits is 17146080, while the sum is 60.

The spelling of 7791239061645 in words is "seven trillion, seven hundred ninety-one billion, two hundred thirty-nine million, sixty-one thousand, six hundred forty-five".