1261013325551 has 8 divisors (see below), whose sum is σ = 1455426979104. Its totient is φ = 1070166895200.

The previous prime is 1261013325461. The next prime is 1261013325571. The reversal of 1261013325551 is 1555233101621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261013325551 - 2²² = 1261009131247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261013325571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891805040 + ... + 891806453.

It is an arithmetic number, because the mean of its divisors is an integer number (181928372388).

Almost surely, 2^{1261013325551} is an apocalyptic number.

1261013325551 is a deficient number, since it is larger than the sum of its proper divisors (194413653553).

1261013325551 is a wasteful number, since it uses less digits than its factorization.

1261013325551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783611601.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 1261013325551 in words is "one trillion, two hundred sixty-one billion, thirteen million, three hundred twenty-five thousand, five hundred fifty-one".