7561621255 has 8 divisors (see below), whose sum is σ = 9081701424. Its totient is φ = 6044126400.

The previous prime is 7561621229. The next prime is 7561621259. The reversal of 7561621255 is 5521261657.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7561621255 - 2¹³ = 7561613063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7561621259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639886 + ... + 651595.

It is an arithmetic number, because the mean of its divisors is an integer number (1135212678).

Almost surely, 2^7561621255 is an apocalyptic number.

7561621255 is a deficient number, since it is larger than the sum of its proper divisors (1520080169).

7561621255 is a wasteful number, since it uses less digits than its factorization.

7561621255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292657.

The product of its digits is 126000, while the sum is 40.

The square root of 7561621255 is about 86957.5830793382. The cubic root of 7561621255 is about 1962.7800732444.

The spelling of 7561621255 in words is "seven billion, five hundred sixty-one million, six hundred twenty-one thousand, two hundred fifty-five".