6958940021257 has 16 divisors (see below), whose sum is σ = 7961114557440. Its totient is φ = 5958778578192.

The previous prime is 6958940021219. The next prime is 6958940021263. The reversal of 6958940021257 is 7521200498596.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6958940021257 - 2¹⁹ = 6958939496969 is a prime.

It is a super-2 number, since 2×6958940021257² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6958940021287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27870594 + ... + 28119172.

It is an arithmetic number, because the mean of its divisors is an integer number (497569659840).

Almost surely, 2^{6958940021257} is an apocalyptic number.

It is an amenable number.

6958940021257 is a deficient number, since it is larger than the sum of its proper divisors (1002174536183).

6958940021257 is a wasteful number, since it uses less digits than its factorization.

6958940021257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252612.

The product of its (nonzero) digits is 10886400, while the sum is 58.

The spelling of 6958940021257 in words is "six trillion, nine hundred fifty-eight billion, nine hundred forty million, twenty-one thousand, two hundred fifty-seven".