10516781051 has 4 divisors (see below), whose sum is σ = 12019178352. Its totient is φ = 9014383752.

The previous prime is 10516781047. The next prime is 10516781057. The reversal of 10516781051 is 15018761501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15018761501 = 37 ⋅405912473.

It is a cyclic number.

It is not a de Polignac number, because 10516781051 - 2² = 10516781047 is a prime.

It is a super-2 number, since 2×10516781051² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10516781057) 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, 751198640 + ... + 751198653.

It is an arithmetic number, because the mean of its divisors is an integer number (3004794588).

Almost surely, 2^10516781051 is an apocalyptic number.

10516781051 is a deficient number, since it is larger than the sum of its proper divisors (1502397301).

10516781051 is an equidigital number, since it uses as much as digits as its factorization.

10516781051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502397300.

The product of its (nonzero) digits is 8400, while the sum is 35.

The spelling of 10516781051 in words is "ten billion, five hundred sixteen million, seven hundred eighty-one thousand, fifty-one".