787512481561 has 45 divisors (see below), whose sum is σ = 877701830891. Its totient is φ = 706584305856.

The previous prime is 787512481559. The next prime is 787512481579. The reversal of 787512481561 is 165184215787.

The square root of 787512481561 is 887419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 705967967961 + 81544513600 = 840219^2 + 285560^2 .

It is not a de Polignac number, because 787512481561 - 2¹ = 787512481559 is a prime.

It is a super-2 number, since 2×787512481561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (787512421561) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8848454805 + ... + 8848454893.

Almost surely, 2^787512481561 is an apocalyptic number.

787512481561 is the 887419-th square number.

787512481561 is the 443710-th centered octagonal number.

It is an amenable number.

787512481561 is a deficient number, since it is larger than the sum of its proper divisors (90189349330).

787512481561 is an frugal number, since it uses more digits than its factorization.

787512481561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 161 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 55.

The spelling of 787512481561 in words is "seven hundred eighty-seven billion, five hundred twelve million, four hundred eighty-one thousand, five hundred sixty-one".