26430121556 has 6 divisors (see below), whose sum is σ = 46252712730. Its totient is φ = 13215060776.

The previous prime is 26430121489. The next prime is 26430121603. The reversal of 26430121556 is 65512103462.

It can be written as a sum of positive squares in only one way, i.e., 23167884100 + 3262237456 = 152210^2 + 57116^2 .

It is a super-2 number, since 2×26430121556² (a number of 22 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 as a sum of consecutive naturals, namely, 3303765191 + ... + 3303765198.

It is an arithmetic number, because the mean of its divisors is an integer number (7708785455).

Almost surely, 2^26430121556 is an apocalyptic number.

It is an amenable number.

26430121556 is a deficient number, since it is larger than the sum of its proper divisors (19822591174).

26430121556 is a wasteful number, since it uses less digits than its factorization.

26430121556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6607530393 (or 6607530391 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 26430121556 in words is "twenty-six billion, four hundred thirty million, one hundred twenty-one thousand, five hundred fifty-six".