11278504161555 has 32 divisors (see below), whose sum is σ = 18486832004928. Its totient is φ = 5868144384000.

The previous prime is 11278504161541. The next prime is 11278504161571. The reversal of 11278504161555 is 55516140587211.

It is not a de Polignac number, because 11278504161555 - 2¹⁶ = 11278504096019 is a prime.

It is a super-2 number, since 2×11278504161555² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11278504161498 and 11278504161507.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10081705 + ... + 11144405.

It is an arithmetic number, because the mean of its divisors is an integer number (577713500154).

Almost surely, 2^{11278504161555} is an apocalyptic number.

11278504161555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11278504161555 is a deficient number, since it is larger than the sum of its proper divisors (7208327843373).

11278504161555 is a wasteful number, since it uses less digits than its factorization.

11278504161555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080007.

The product of its (nonzero) digits is 1680000, while the sum is 51.

The spelling of 11278504161555 in words is "eleven trillion, two hundred seventy-eight billion, five hundred four million, one hundred sixty-one thousand, five hundred fifty-five".