1261406855158 has 8 divisors (see below), whose sum is σ = 1991695034520. Its totient is φ = 597508510320.

The previous prime is 1261406855123. The next prime is 1261406855183. The reversal of 1261406855158 is 8515586041621.

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

It is a super-2 number, since 2×1261406855158² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16597458583 + ... + 16597458658.

It is an arithmetic number, because the mean of its divisors is an integer number (248961879315).

Almost surely, 2^{1261406855158} is an apocalyptic number.

1261406855158 is a deficient number, since it is larger than the sum of its proper divisors (730288179362).

1261406855158 is a wasteful number, since it uses less digits than its factorization.

1261406855158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33194917262.

The product of its (nonzero) digits is 2304000, while the sum is 52.

The spelling of 1261406855158 in words is "one trillion, two hundred sixty-one billion, four hundred six million, eight hundred fifty-five thousand, one hundred fifty-eight".