1278201246958 has 16 divisors (see below), whose sum is σ = 1921018940784. Its totient is φ = 637862258880.

The previous prime is 1278201246953. The next prime is 1278201246961. The reversal of 1278201246958 is 8596421028721.

It is a super-2 number, since 2×1278201246958² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1278201246899 and 1278201246908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278201246953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3762541 + ... + 4088167.

It is an arithmetic number, because the mean of its divisors is an integer number (120063683799).

Almost surely, 2^{1278201246958} is an apocalyptic number.

1278201246958 is a deficient number, since it is larger than the sum of its proper divisors (642817693826).

1278201246958 is a wasteful number, since it uses less digits than its factorization.

1278201246958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329427.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 1278201246958 in words is "one trillion, two hundred seventy-eight billion, two hundred one million, two hundred forty-six thousand, nine hundred fifty-eight".