19649620861390 has 64 divisors (see below), whose sum is σ = 40367194027776. Its totient is φ = 6822273871872.

The previous prime is 19649620861357. The next prime is 19649620861393. The reversal of 19649620861390 is 9316802694691.

It is a happy number.

It is a super-2 number, since 2×19649620861390² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649620861393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1592847 + ... + 6468106.

It is an arithmetic number, because the mean of its divisors is an integer number (630737406684).

Almost surely, 2^{19649620861390} is an apocalyptic number.

19649620861390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19649620861390 is an abundant number, since it is smaller than the sum of its proper divisors (20717573166386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19649620861390 is a wasteful number, since it uses less digits than its factorization.

19649620861390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8062093.

The product of its (nonzero) digits is 30233088, while the sum is 64.

The spelling of 19649620861390 in words is "nineteen trillion, six hundred forty-nine billion, six hundred twenty million, eight hundred sixty-one thousand, three hundred ninety".