612651561 has 16 divisors (see below), whose sum is σ = 880837440. Its totient is φ = 377498880.

The previous prime is 612651547. The next prime is 612651563. The reversal of 612651561 is 165156216.

It is not a de Polignac number, because 612651561 - 2⁶ = 612651497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (612651563) 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, 128740 + ... + 133413.

It is an arithmetic number, because the mean of its divisors is an integer number (55052340).

Almost surely, 2^612651561 is an apocalyptic number.

It is an amenable number.

612651561 is a deficient number, since it is larger than the sum of its proper divisors (268185879).

612651561 is a wasteful number, since it uses less digits than its factorization.

612651561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262216.

The product of its digits is 10800, while the sum is 33.

The square root of 612651561 is about 24751.7991467287. The cubic root of 612651561 is about 849.3196683019.

It can be divided in two parts, 61265 and 1561, that added together give a palindrome (62826).

The spelling of 612651561 in words is "six hundred twelve million, six hundred fifty-one thousand, five hundred sixty-one".